Indoor antenna



FIG. 1 is a top plan view of an indoor antenna showing my new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a right side elevational view thereof, the left side being a mirror image; and

FIG. 5 is a rear elevational view thereof.

The broken line showing in FIG. 4 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for an indoor antenna, as shown and described. 